An Attack on the Identity-Based Key Agreement Protocols in Multiple PKG Environment
JoongHyo Oh · IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences · 2006
Lee et al. recently proposed the first identity-based key agreement protocols for a multiple PKG environment where each PKG has different domain parameters in ICCSA 2005. However, this letter demonstrates that Lee et al.'s scheme does not include the property of implicit key authentication which is the fundamental security requirement, making it vulnerable to an impersonation attack.